The C–C single bond length is 1.54 Angstroms and that of Cl–Cl is 1.98 Angstroms. If the electronegativity of Cl and C are 3.0 and 2.5 respectively, the C–Cl bond-length will be equal to

For a diatomic Hetero molecule:

Bond Length (l) = r_A + r_B- 0.09(X_A-X_B)

Where XA= Electronegativity of more electronegative atom

Where XB= Electronegativity of less electronegative atom

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